how to make a linux fedora core 6 to a firewall

As the other have stated you can use a gui app like shorewall or write a...

As the other have stated you can use a gui app like shorewall or write a custom iptables script your self using the cited tutorials.

The reason that Andrea is recommending against using fedora as a firewall is because it is a full featured OS that requires many program that are not used and may contain vulnerabilities that can compromise the firewall function. It is recommended to use a basic firewall or router centered distro instead so only the necessary applications are install, effectively limiting your potential for exposure.

Don't do it !Use something different than Fedora, my votes go to Shorewall ...

Don't do it !Use something different than Fedora, my votes go to Shorewall (already cited) and IPCop (www.ipcop.org)These are more firewall related for the configuration part, if you're a geek or if you know iptables very well you don't even need them.

The shorewall (Shoreline Firewall) application is my personal choice for turning a Linux PC into a firewall. It internally uses IPTables, but it puts some nice configuration files around it so you can more clearly specify what you want without fighting so much with the various iptables command-line options.

As for Fedora, the biggest problem with it (as a firewall) is that is only supported for 13 months (2 releases plus a month of extra), which means that even today, only Fedora 11 and 12 are supported, and as a firewall, having security updates available for the OS seems like kind of an important thing.

I think CentOS [the open-source version of RedHat Enterprise Linux], which is very similar to Fedora from a configuration/available-software perspective, might be a better choice, as it will be supported long after even Fedora 12 is ancient history.